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Diện tích hình vuông là :
9 x 9 = 81 ( cm2 )
Đáp số : 81 cm2 .
Diện tích hình vuông là :
9 x 9 = 81 ( cm2 )
đáp số : 81 cm2
a2+2ab+b2−ac−bc=(a+b)2−c(a+b)=(a+b)(a+b−c)a2+2ab+b2−ac−bc=(a+b)2−c(a+b)=(a+b)(a+b−c)
x2−2x+1−4y2−4y−1=(x−1)2−(2y+1)2=(x+2y)(x−2y−2)x2−2x+1−4y2−4y−1=(x−1)2−(2y+1)2=(x+2y)(x−2y−2)x2(x−1)−16(x−1)=(x−1)(x2−16)=(x−1)(x+4)(x−4)x2(x−1)−16(x−1)=(x−1)(x2−16)=(x−1)(x+4)(x−4) x2y−x3−9y+9x=x2(y−x)−9(y−x)=(y−x)(x2−9)(y−x)(x−3)(x+3)
x2−y2−2x+2y=(x+y)(x−y)−2(x−y)=(x+y−2)(x−y)x2−y2−2x+2y=(x+y)(x−y)−2(x−y)=(x+y−2)(x−y) 2x+2y−x2−xy=2(x+y)−x(x+y)=(2−x)(x+y)2x+2y−x2−xy=2(x+y)−x(x+y)=(2−x)(x+y)
3a2−6ab+3b2−12c2=3(a2−2ab+b2−4c2)=3(a−b)2−3(2c)2=3(a−b+2c)(a−b−2c)3a2−6ab+3b2−12c2=3(a2−2ab+b2−4c2)=3(a−b)2−3(2c)2=3(a−b+2c)(a−b−2c) x2−25+y2+2xy=(x+y)2−25=(x+y−5)(x+y+5)
1. Be quiet! The baby (sleep) ___is sleeping____________
2. The sun (set) ___sets____________ in the West
3. Mr Green always (go) __goes_____________ to work by bus.
4. It (not rain) ___doesn't rain____________ in the dry season.
5. They (have) ___are having____________ lunch in the cafeteria now.
6. She ______will go_________ (go) camping tomorrow.
7. The doctor sometimes (return) ___returns____________ home late.
8. He (write) ___is wriiting____________ a long novel at present.
9. Look! The bus (come) ___is comming____________
10. The earth (move) ___moves____________ around the sun.
11. What will you (do) _____do__________ at 8 p.m yesterday?
12. His uncle (teach) __has taught_____________ English in our shool five years ago.
13. The old man (fall) __fell_____________as he (get) _____got__________ into the bus.
14. When I saw him, he (sit) ___was sitting____________ asleep in a chair.
15. She _____will visit__________ (visit) her aunt next week.
Mi / watch / TV / evening
=> Mi watches TV every evening
.you / walk / school / everyday?
=> Do you walk to school everyday ?
How / your mother / go / work?
=> How does your mother go to work ?
What time / they / start / work?
=> What time do they start to work ?
Nick / be / my friend / . He / come / London
=> Nick is my friend . He comes from London
How often / you / brush / teeth, Hoa? – I / brush / teeth / once /day.
=> How often do you brush your teeth , Hoa ? - I brush my teeth once a day
She / not / live / the country. She / live / city / her family
=> She doesn't live in the country .She lives in the city with her family
there / be / 6 / people /her family?
=> Are there 6 people in her family ?
We / watch / TV / moment
=> We are watching TV at the moment
They / water / flowers / the garden
=> They are watering the flowwrs in the garden
he/ have / lunch / now? – No. He / do / homework
=> Is he having lunch now ? - No , he is doing his homework
The children / not play / games / living room.
=> The children aren't playing games in the living room
your mom / cook / moment?
=? Is your mom cooking at the moment ?
Mi / her friends / chat / now?
=> Are Mi and her friends chatting now ?
. Dùng từ gợi ý viết các câu sau ở thì hiện tại tiếp diễn.
We / watch / TV / moment
=> We are watching TV at the moment.
They / water / flowers / the garden
=> They are watering the flowers in the garden.
he / have / lunch / now? – No. He / do / homework
=> Is he having lunch now? - No. He is doing the homework.
The children / not play / games / living room.
=> The children are not playing games in the living room.
your mom / cook / moment?
=> is your mom cooking at the moment.
Mi / her friends / chat / now?
=> Are Mi and her friends chatting now ?
Tìm nghiệm nguyên x;y của phương trình \(x^2-xy=6x-5y-8\)
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